Dual hydraulic machine transmission
Patent No. 7,416,045
Issued: August 26, 2008
The modular transmission uses only a pair of small and light hydraulic machines of remarkably improved volumetric efficiency with pistons having body portions substantially as long as the axial length of the respective cylinders in which they reciprocate. The two hydraulic machines operate in a closed loop, one being used as a pump driven by the vehicle's engine, and the other used as a motor. Each machine has a fully articulatable swash plate. By computer control, the angles of the swash plates of the two machines are infinitely varied to provide an appropriate optimum ratio of engine/wheel speed for all conditions from start-up, city driving, hill climbing varied according to load and steepness, and over-drive for highway. This complete vehicle operation is attained while the vehicle's engine continues to operate at relatively constant speeds and relatively low RPM.
Reference to Related Applications
This is a continuation-in-part patent application of co-pending application Ser. No. 10/789,739, filed Feb. 27, 2004, entitled "LONG-PISTON HYDRAULIC MACHINES", which is a continuation-in-part of application Ser. No. 10/647,557, filed Aug. 25, 2003, entitled "LONG-PISTON HYDRAULIC MACHINES", now abandoned, which was a continuation-in-part of parent patent application Ser. No. 10/229,407, filed Aug. 28, 2002, entitled "LONG-PISTON HYDRAULIC MACHINES", now abandoned. The aforementioned applications are hereby incorporated herein by reference.
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